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2) Survey all AC appliances and determine how many watt-hours will be consumed by
each during that same period. For instance, if a 100 watt TV will be powered for 3
hours, that equals 300 watt-hours. If a 1,500 watt microwave will also be run for half
an hour, then that is another 750 watt-hours (i.e., 1,500 x .5). Bear in mind that
some loads, such as refrigerators, are intermittent, so an average must be used.
3) Add up the total watt-hour consumption of all appliances, then apply this simple
rule to determine total DC (battery) amp-hours consumed:
12 Volt Inverters: Divide Watt-Hours by 10
24 Volt Inverters: Divide Watt-Hours by 20
Note: These divisors allow for standard inefficiency during voltage conversion.
4) Finally, since it is generally recommended that batteries never be discharged below
50%, the result must be multiplied by 2 to obtain the proper total battery capacity.
Example # 1: You have a 12 volt inverter. Your total consumption between recharge cycles
is 2,400 watt-hours, so...
2,400 ÷ 10 = 240 (Amp-Hours Consumed)
240 x 2 = 480
So, in this example, a properly sized battery system will be rated for at least 480 amp-hours.
Example # 2: You have a 24 volt inverter. Your total consumption between recharge cycles
is 3,600 watt-hours, so...
3,600 ÷ 20 = 180 (Amp-Hours Consumed)
180 x 2 = 360
In this case, you need a battery system rated for at least 360 amp-hours.
F) Battery (DC) Wiring
CAUTION: Ensure that hydrogen gas does not accumulate near the battery by keeping the
area well ventilated. A substantial spark may result when connecting the final battery wiring
due to an initial charging of the internal input capacitor.
Refer to Figure 2 on the following page for a typical battery wiring scheme.
6
U.S.A. HEADQUARTERS
P.O. Box 1306, Newport Beach, CA 92663
Phone: 714-751-0488 Fax: 714-957-1621
E-Mail: sales@newmarpower.com
www.newmarpower.com
EURO WAREHOUSE
Phone:+31-35-603-2494 Fax:+31-35-603-2149
E-Mail: newmareuro@newmarpower.com
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